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Justin Tyler Berfield (born February 25, 1986) is an American writer, producer and actor. He is known for his portrayals of Reese on the family sitcom Malcolm in the Middle and Ross Malloy on The WB sitcom Unhappily Ever After. As of 2010, Berfield is Chief Creative Officer of Virgin Produced, a film and television development, packaging, and production company announced in 2010 by the Virgin Group.
| Year | Title | Role | Notes |
| 1998 | Mom, Can I Keep Her? | Timmy Blair | |
| 1999 | Invisible Mom 2 | Eddie Brown | |
| The Boy with the X-Ray Eyes | Andy | ||
| 2001 | Max Keeble's Big Move | Caption Writer | |
| 2002 | Who's Your Daddy? | Danny Hughes | |
| 2006 | Romance and Cigarettes | Producer | |
| 2007 | Blonde Ambition |
| Year | Title | Role | Notes |
| 1994 | The Good Life | Bob Bowman | Main role;13 episodes |
| Hardball | Kid | 2 episodes | |
| The Boys Are Back | Timmy Flint | 4 episodes | |
| 1996 | Duckman | Episode: "Exile in Guyville" | |
| 1995–1999 | Unhappily Ever After | Ross Malloy | Main role; 100 episodes |
| 2000–2006 | Malcolm in the Middle | Reese | Main role; 151 episodes |
| 2001 | The Nightmare Room | Josh Ryan | Episode: "Tangled Web" |
| 2002–2004 | Kim Possible | Gill | Voice, 2 episodes |
| 2004 | The Fairly OddParents | Ving | Voice episode: "Crash Nebula" |
| 2005 | Filthy Rich: Cattle Drive | Producer, screenplay | |
| 2007 | The Pet Detective | Television film; producer and director | |
| 2010 | Sons of Tucson | Barry | 1 episode; also producer |
| 2012 | Virgin Produced: Comedy Vault | Television film; producer | |
| 2025 | Malcolm in the Middle: Life's Still Unfair | Reese | Post-production |
| Awards | ||||
| Year | Result | Award | Category | Nominated work |
| 1998 | Nominated | Young Artist Awards | Best Performance in a TV Comedy Series: Supporting Young Actor | Unhappily Ever After |
| 1999 | Nominated | |||
| Nominated | YoungStar Awards | Best Performance by a Young Actor in a Comedy TV Series | ||
| 2000 | Won | Best Young Ensemble Cast: Television | Malcolm in the Middle | |
| 2001 | Nominated | Young Artist Awards | Best Ensemble in a TV Series (Comedy or Drama) | |
| 2002 | Nominated | Best Performance in a Feature Film: Supporting Young Actor | Max Keeble's Big Move | |
| Nominated | Best Ensemble in a TV Series (Comedy or Drama) | Malcolm in the Middle | ||
| 2003 | Won | |||
| Nominated | Best Performance in a TV Series (Comedy or Drama): Supporting Young Actor | |||